AST-111 Exam 3 || Already Graded A+.

Due to its size, temperature, and distance, we have not been able to determine the __________ of the Sun. correct answers We have been able to determine all of these. In which region of the Sun is energy absorbed and reemitted as it moves toward the surface? correct answers radiation zone The phase of matter in the Sun is __________. correct answers plasma How does the Sun generate energy today? correct answers nuclear fusion What processes are involved in the sunspot cycle? correct answers the winding of magnetic field lines due to differential rotation The Sun will exhaust its nuclear fuel in about __________. correct answers 5 billion years The core of a star more massive than the Sun that is burning hydrogen in its core should have a __________ temperature and a __________ pressure. correct answers higher temperature, higher pressure If the core temperature of a star drops, the rate of fusion of hydrogen into helium will __________. correct answers decrease Which of the following is the correct list of regions of the Sun, going from highest temperature to lowest? correct answers core, radiation zone, convection zone, photosphere What percentage of the mass of hydrogen is converted to energy by the fusion process in the Sun? correct answers 0.7% How many hydrogen nuclei does it take to produce a helium nucleus? correct answers 4 What do we mean when we say that the Sun is in gravitational equilibrium? correct answers There is a balance within the Sun between the outward push of thermal pressure and the inward pull of gravity. Recall that temperature and wavelength are related for thermal radiation. What type of radiation is the most prevalent in the radiation zone of the Sun? correct answers X-rays Which of the following is not a way by which we can study the inside of the Sun? correct answers We can send a space probe into the Sun's photosphere. Which of the following best describes why the Sun emits most of its energy in the form of visible light? correct answers Like all objects, the Sun emits thermal radiation with a spectrum that depends on its temperature, and the Sun's surface temperature is just right for emitting mostly visible light.